Gaming machine top box



FIG. 1 is a perspective view of a gaming machine top box, showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a gaming machine top box, as shown and described. 